We had left them in place during our passage
from New Caledonia
, with 2 days of 20-35kn of wind
close-hauled: they hadn't moved.
Now, this is light cheap
netting fabric and it will get burnt by the sun after a few months, but you just cut anothe patch: no need to cut to exact dimensions, just pull it tight to your likening and the velcro will hold it, then cut roughly around it if you want a clean look.